150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Quote:I wish I had one for him.
Used acronyms: NEML=Naked Eye Magnitude Limit, SQM=Sky Quality Meter, TML=Telescope Magnitude Limit, CO=Central Obstruction, delta_m=difference in magnitudes between double star components, RoT=Rule of Thumb, pD_mm=proposed D_mm for resolving a binary (ident with earlier used pA=proposed Aperture), D_mm=Diameter (of scope) in mm, UCAC4=USNO CCD Astrograph Catalog 4th edition
Quote:Glenn, the best prospect for highest accuracy measures is recent speckle measures of doubles. There are science papers, some available online, that discuss the improved level of accuracy attainable. Otherwise, the 6th Orbit Catalog, same site as the WDS, the USNO astrometry section. Orbits with a "grade 1" rating are likely to be very accurate. Quite a few grade 2 orbits are of high standard too for getting high accuracy separations.
Quote:Did Edz ever weigh on the queries you guys made?Pete
Quote:... in Lord's table ... edge of disk center is another point that needs discussion. He seems to have chosen an arbitrary point, that at which the light is 50% or one half of the peak intensity. ... Are we to assume the disk edge cannot be seen beyond a point where the light intensity drop below 50% of peak intensity? Or is this simply an arbitrary point? I think it is just an easily identified arbitrary point used forr consistency...edz